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Crystals 2015, 5(3), 312-326; doi:10.3390/cryst5030312

Nickel-Doped Ceria Nanoparticles: The Effect of Annealing on Room Temperature Ferromagnetism

1
Energy Safety Research Institute (ESRI), College of Engineering, Swansea University, Bay Campus, Fabian Way Swansea SA1 8EN, UK
2
School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, UK
3
UCL Healthcare Biomagnetics Laboratories, Royal Institution of Great Britain, 21 Albemarle Street, London W1S 4BS, UK
4
School of Materials, University of Manchester, Oxford Road, Manchester M13 9PL, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Ramesh K. Guduru
Received: 30 June 2015 / Revised: 21 July 2015 / Accepted: 17 August 2015 / Published: 21 August 2015
(This article belongs to the Special Issue Nanostructured Oxide Crystals)
View Full-Text   |   Download PDF [1775 KB, uploaded 21 August 2015]   |  

Abstract

Nickel-doped cerium dioxide nanoparticles exhibit room temperature ferromagnetism due to high oxygen mobility within the doped CeO2 lattice. CeO2 is an excellent doping matrix as it can lose oxygen whilst retaining its structure. This leads to increased oxygen mobility within the fluorite CeO2 lattice, leading to the formation of Ce3+ and Ce4+ species and hence doped ceria shows a high propensity for numerous catalytic processes. Magnetic ceria are important in several applications from magnetic data storage devices to magnetically recoverable catalysts. We investigate the effect doping nickel into a CeO2 lattice has on the room temperature ferromagnetism in monodisperse cerium dioxide nanoparticles synthesised by the thermal decomposition of cerium(III) and nickel(II) oleate metal organic precursors before and after annealing. The composition of nanoparticles pre- and post-anneal were analysed using: TEM (transmission electron microscopy), XPS (X-ray photoelectron spectroscopy), EDS (energy-dispersive X-ray spectroscopy) and XRD (X-ray diffraction). Optical and magnetic properties were also studied using UV/Visible spectroscopy and SQUID (superconducting interference device) magnetometry respectively. View Full-Text
Keywords: ceria; nickel doping; ferromagnetism; catalysis; nanoparticles ceria; nickel doping; ferromagnetism; catalysis; nanoparticles
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Bear, J.C.; McNaughter, P.D.; Southern, P.; O’Brien, P.; Dunnill, C.W. Nickel-Doped Ceria Nanoparticles: The Effect of Annealing on Room Temperature Ferromagnetism. Crystals 2015, 5, 312-326.

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